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<p>[QUOTE=&quot;dougsmit, post: 2020675, member: 19463&quot;]I can&#039;t say I subscribe to the theory that all coins out of the ground are enroute to an ugly death as a pile of powder but I do believe it is a mistake to clean and tone and clean again in an endless cycle.&nbsp; Some surface tone layers or patinas serve as a natural barrier to further corrosion.&nbsp; Removing them is a mistake. </p><p>[ATTACH=full]365680[/ATTACH] </p><p>&nbsp;I have black silver coins which I do not consider in need of protection but I certainly do not consider them candidates for cleaning in search of silver down below.&nbsp; I recall seeing a bag of several hundred Athenian tetradrachms at a show.&nbsp; They were dark gray and probably destined to be processed into the shiny baubles we all see so often in owls.&nbsp; It is a fact that more people will pay for a bright coin than a dark gray one.[/QUOTE]</p><p><br /></p>

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